[RFC PATCH 09/16] ext4: count reserved metadata blocks for delalloc per inode

[Zhang Yi <yi.zhang@huaweicloud.com>]

From: Zhang Yi <yi.zhang@huawei.com>

Add a new parameter ei->i_reserved_ext_blocks to prepare for reserving
metadata blocks for delalloc. This parameter will be used to count the
per inode's total reserved metadata blocks, this value should always be
zero when the inode is dieing. Also update the corresponding
tracepoints and debug interface.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
 fs/ext4/ext4.h              |  1 +
 fs/ext4/inode.c             |  2 ++
 fs/ext4/super.c             | 10 +++++++---
 include/trace/events/ext4.h | 25 +++++++++++++++++--------
 4 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 84618c46f239..ee2dbbde176e 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1104,6 +1104,7 @@ struct ext4_inode_info {
 	/* allocation reservation info for delalloc */
 	/* In case of bigalloc, this refer to clusters rather than blocks */
 	unsigned int i_reserved_data_blocks;
+	unsigned int i_reserved_ext_blocks;
 
 	/* pending cluster reservations for bigalloc file systems */
 	struct ext4_pending_tree i_pending_tree;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 861602903b4d..dda17b3340ce 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1606,6 +1606,8 @@ static void ext4_print_free_blocks(struct inode *inode)
 	ext4_msg(sb, KERN_CRIT, "Block reservation details");
 	ext4_msg(sb, KERN_CRIT, "i_reserved_data_blocks=%u",
 		 ei->i_reserved_data_blocks);
+	ext4_msg(sb, KERN_CRIT, "i_reserved_ext_blocks=%u",
+		 ei->i_reserved_ext_blocks);
 	return;
 }
 
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index bb42525de8d0..7bc7c8c0ed71 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1436,6 +1436,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
 	ei->i_es_shk_nr = 0;
 	ei->i_es_shrink_lblk = 0;
 	ei->i_reserved_data_blocks = 0;
+	ei->i_reserved_ext_blocks = 0;
 	spin_lock_init(&(ei->i_block_reservation_lock));
 	ext4_init_pending_tree(&ei->i_pending_tree);
 #ifdef CONFIG_QUOTA
@@ -1487,11 +1488,14 @@ static void ext4_destroy_inode(struct inode *inode)
 		dump_stack();
 	}
 
-	if (EXT4_I(inode)->i_reserved_data_blocks)
+	if (EXT4_I(inode)->i_reserved_data_blocks ||
+	    EXT4_I(inode)->i_reserved_ext_blocks)
 		ext4_msg(inode->i_sb, KERN_ERR,
-			 "Inode %lu (%p): i_reserved_data_blocks (%u) not cleared!",
+			 "Inode %lu (%p): i_reserved_data_blocks (%u) or "
+			 "i_reserved_ext_blocks (%u) not cleared!",
 			 inode->i_ino, EXT4_I(inode),
-			 EXT4_I(inode)->i_reserved_data_blocks);
+			 EXT4_I(inode)->i_reserved_data_blocks,
+			 EXT4_I(inode)->i_reserved_ext_blocks);
 }
 
 static void ext4_shutdown(struct super_block *sb)
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 65029dfb92fb..115f96f444ff 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -1224,6 +1224,7 @@ TRACE_EVENT(ext4_da_update_reserve_space,
 		__field(	__u64,	i_blocks		)
 		__field(	int,	used_blocks		)
 		__field(	int,	reserved_data_blocks	)
+		__field(	int,	reserved_ext_blocks	)
 		__field(	int,	quota_claim		)
 		__field(	__u16,	mode			)
 	),
@@ -1233,18 +1234,19 @@ TRACE_EVENT(ext4_da_update_reserve_space,
 		__entry->ino	= inode->i_ino;
 		__entry->i_blocks = inode->i_blocks;
 		__entry->used_blocks = used_blocks;
-		__entry->reserved_data_blocks =
-				EXT4_I(inode)->i_reserved_data_blocks;
+		__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
+		__entry->reserved_ext_blocks = EXT4_I(inode)->i_reserved_ext_blocks;
 		__entry->quota_claim = quota_claim;
 		__entry->mode	= inode->i_mode;
 	),
 
 	TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu used_blocks %d "
-		  "reserved_data_blocks %d quota_claim %d",
+		  "reserved_data_blocks %d reserved_ext_blocks %d quota_claim %d",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  (unsigned long) __entry->ino,
 		  __entry->mode, __entry->i_blocks,
-		  __entry->used_blocks, __entry->reserved_data_blocks,
+		  __entry->used_blocks,
+		  __entry->reserved_data_blocks, __entry->reserved_ext_blocks,
 		  __entry->quota_claim)
 );
 
@@ -1258,6 +1260,7 @@ TRACE_EVENT(ext4_da_reserve_space,
 		__field(	ino_t,	ino			)
 		__field(	__u64,	i_blocks		)
 		__field(	int,	reserved_data_blocks	)
+		__field(	int,	reserved_ext_blocks	)
 		__field(	__u16,  mode			)
 	),
 
@@ -1266,15 +1269,17 @@ TRACE_EVENT(ext4_da_reserve_space,
 		__entry->ino	= inode->i_ino;
 		__entry->i_blocks = inode->i_blocks;
 		__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
+		__entry->reserved_ext_blocks = EXT4_I(inode)->i_reserved_ext_blocks;
 		__entry->mode	= inode->i_mode;
 	),
 
 	TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu "
-		  "reserved_data_blocks %d",
+		  "reserved_data_blocks %d reserved_ext_blocks %d",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  (unsigned long) __entry->ino,
 		  __entry->mode, __entry->i_blocks,
-		  __entry->reserved_data_blocks)
+		  __entry->reserved_data_blocks,
+		  __entry->reserved_ext_blocks)
 );
 
 TRACE_EVENT(ext4_da_release_space,
@@ -1288,6 +1293,7 @@ TRACE_EVENT(ext4_da_release_space,
 		__field(	__u64,	i_blocks		)
 		__field(	int,	freed_blocks		)
 		__field(	int,	reserved_data_blocks	)
+		__field(	int,	reserved_ext_blocks	)
 		__field(	__u16,  mode			)
 	),
 
@@ -1297,15 +1303,18 @@ TRACE_EVENT(ext4_da_release_space,
 		__entry->i_blocks = inode->i_blocks;
 		__entry->freed_blocks = freed_blocks;
 		__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
+		__entry->reserved_ext_blocks = EXT4_I(inode)->i_reserved_ext_blocks;
 		__entry->mode	= inode->i_mode;
 	),
 
 	TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu freed_blocks %d "
-		  "reserved_data_blocks %d",
+		  "reserved_data_blocks %d reserved_ext_blocks %d",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  (unsigned long) __entry->ino,
 		  __entry->mode, __entry->i_blocks,
-		  __entry->freed_blocks, __entry->reserved_data_blocks)
+		  __entry->freed_blocks,
+		  __entry->reserved_data_blocks,
+		  __entry->reserved_ext_blocks)
 );
 
 DECLARE_EVENT_CLASS(ext4__bitmap_load,
-- 
2.39.2